Remove logback

[bmarwell]

Most modules use log4j2, so logback snuck in by accident. Replace logback with log4j2.

[fpapon]

I'm already working on this one, the only place we are using logback is on the hasher tool unit test:

https://github.com/apache/shiro/blob/main/tools/hasher/src/test/java/org/apache/shiro/tools/hasher/HasherTest.java